When it comes to the friend roommate contract, you’re probably most familiar from hearing about “The Roommate Agreement” on hit TV show The Big Bang Theory. While it is far from a basic roommate form, the concept of the roommate agreement can be applied to real life—you don’t need a “Godzilla clause” but having clear rules between you and your friends and roommates can be a great way to lay down ground rules without putting your friendship on the line or having anyone take advantage of anyone else.

Moving in with friends is a great way to save cash on rent and utilities but it also comes with the inherit duty of laying down ground rules. When deciding how to write up a friendship contract agreement, there are a few things you need to consider, and it all starts with listing out responsibilities and duties between you and your friend/roommates.

Here are a few things to consider having added to your list:

Who is most responsible and who gets what?

As you determine how to write up a friendship contract agreement, you’re going to encounter one problem first: if the unit you’re staying in has a bedroom that’s larger than the other, who gets it? Is there more than one bathroom? Who has to clean the larger one? Write down who will be responsible for each “private” space in your agreement—you may decide to let the person who found the apartment have the larger bedroom.

How will bills be paid?

There are a few options to choose from when you decide to get the utilities paid. You could split up the cost and have each roommate take a particular bill and list them on the basic roommate form (such as one person being responsible for the electric bill and the other paying the water bill). If a bill is going to be paid by a particular person, make sure that only their name is on the bill. If someone is irresponsible and doesn’t pay their share of the bill, you don’t want to have your reputation and credit score damaged by their mistake. You could also just have all the bills added together at the end of the month and all of the roommates split the costs evenly.

Who buys the groceries?

This one can be trick and a friend roommate contract can come in handy for grocery shopping. You should make a list of essentials that should be picked up no matter who goes shopping and then decide a schedule for who buys groceries on the weekly shopping trip. If things get too complicated, you could all agree that each person will buy their own food—just make sure everyone is on the same page.

In the end the key on how to write up a friendship contract agreement is about determining every aspect of living together and setting ground rules that everyone can abide by. Make sure to include guest rules, pet rules, parking, and anything you can think of.

Once you have your terms set, simply type up an agreement or use a roommate friendship form template that lists all of the friends and roommates, the responsibilities they share, and have everyone sign it.